This is a small but powerful utility extension designed to solve one very specific and recurring problem in OpenCart 3: the PHP deprecation warning preg_replace(): Passing null to parameter that frequently appears in the storage/modification/system/engine/action.php file.

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This error is almost always caused by another extension or theme that incorrectly modifies the action.php core file. Because the error exists in the modified file within the storage/modification cache directory, any manual fix you apply is wiped out every time you click the "Refresh" button in the admin Extensions -> Modifications area.

The Permanent PHP Fixer solves this problem by acting as a "patch". It runs every time you refresh your modifications cache, automatically finding the buggy line of code created by the other extension and replacing it with the corrected, safe version.

This is a "set and forget" extension. Once installed, it works silently in the background to keep your system error-free. There are no settings to configure.